IB›IB Chemistry SL›Mind mapsS1.1 Introduction to the particulate nature of matterIB Chemistry SL: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsSubstancesElement: cannot be chemically broken downCompound: different atoms bonded in a fixed ratioMixture: no fixed ratio, not bondedMixtures separate by physical methodsPropertiesCompound properties differ from its elementsMixture keeps its components' propertiesPure substances have sharp melting pointsMixtures melt or boil over a rangeHomogeneous: uniform, e.g. air, alloysParticle modelSolid: close, regular, vibrate in placeLiquid: close, irregular, slide pastGas: far apart, fast, randomGas attractions are negligibleMatterparticulate natureslgaqKTemperatureKelvin measures average kinetic energyT(K)=T(∘C)+273T(\text{K}) = T(^\circ\text{C}) + 273T(K)=T(∘C)+2730 K is absolute zeroSame T means same average Ek for all gasesState changesSublimation: solid straight to gasTemperature is constant during a change of stateEnergy overcomes attractions, not EkBoiling plateau longer than melting plateauEvaporation only at the surfaceExam tipsMore than one element does not mean mixtureWater made in a reaction is (l), not (aq)Kelvin has no degree signGive state symbols in every equation